10 Free Chrome Extensions Every Developer Should Install in 2026

Browser extensions can be junk or genuinely useful. The difference
usually comes down to whether they solve a real problem you
actually encounter, or whether they're novelty installs that sit
dormant in your toolbar.

Here are 10 free extensions that solve specific, real developer
problems. No paywalls, no "upgrade to pro" gatekeeping on the
core functionality.

1. Wayback Quick Access

Access any page's archive.org history in one click. When you're
researching how a site's API documentation has changed, checking
when a competitor's pricing changed, or recovering a deleted
resource, this saves the four-step manual process of going to
archive.org and searching. It opens the Wayback Machine calendar
for whatever URL is in your current tab.

2. Shopify Theme Detector

Identifies the Shopify theme and installed apps on any Shopify
store. Useful if you're building Shopify apps, working with
Shopify clients, or doing competitive research. One click gives
you the complete detectable technology stack of any Shopify
storefront.

3. JSON Viewer

Any JSON file opened directly in Chrome becomes formatted,
collapsible, syntax-highlighted output instead of a wall of
text. Essential for working with APIs, config files, and data
files in the browser.

4. Viewport Resizer

Test responsive layouts at specific breakpoints without opening
DevTools and manually dragging. Lets you quickly check how a
page looks at mobile, tablet, and various desktop sizes.

5. ModHeader

Add, modify, or remove HTTP request and response headers while
browsing. Useful for testing auth flows, CORS configurations,
and simulating requests with specific headers without writing
curl commands for every test.

6. CSS Peeper

Extracts CSS styles, color palettes, fonts, and assets from any
webpage without opening DevTools. Faster than computed styles
panel for quick visual design inspection.

7. Wappalyzer

Identifies the technologies running any website — framework,
CMS, analytics, CDN, hosting provider. Broader than Shopify
Theme Detector; covers the entire web stack for any site.

8. Link Redirect Trace

Follows every redirect in a chain and shows you the full
redirect path with HTTP status codes. Invaluable for debugging
OAuth flows, affiliate links, SEO redirect issues, and any
situation where you need to know exactly where a URL resolves.

9. EditThisCookie

View, edit, add, delete, and export cookies for the current
page. Useful for debugging session issues, testing cookie-based
authentication, and inspecting what cookies a page sets.

10. axe DevTools

Runs accessibility audits on any page and reports WCAG violations
directly in the browser. The free tier covers the most critical
accessibility checks and integrates with DevTools. If you're
building anything user-facing, this should be running regularly.

A Note on Extension Management

Twenty extensions running simultaneously slow your browser and
represent a security surface. The extensions above are narrow
in scope — they do specific things and don't require broad
permissions like "read all data on all websites."

Review permissions before installing anything. Extensions that
request more access than they need for their stated function are
a red flag. The ones listed here have permission scopes that
match their functionality.

Conclusion

The right set of browser extensions makes a real difference in
development velocity. These 10 solve the problems you'll actually
encounter — not hypothetical ones — and they're all free to use
without limitation.